[Bug 1549504] Re: multipath discovery failed during install due to LVM volumes locking individual paths

[Mathew Hodson]

** Changed in: hw-detect (Ubuntu)
   Importance: Undecided => Medium

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Title:
  multipath discovery failed during install due to LVM volumes locking
  individual paths

Status in hw-detect package in Ubuntu:
  New

Bug description:
  During a Xenial installation, some of the multipath devices were not
  discovered, as individual paths were locked by active LVM volumes.

  The fix is to deactivate LVM volumes before multipath discovery (in
  hw-detect), and activate multipath partitions during partman/init.d
  (in partman-multipath), so that LVM volumes can be re-activated on top
  of the multipath devices (slightly afterward on partman/init.d/26lvm-
  devices).

  Failure:

  ~ # multipath -v5
  <...>
  Feb 22 14:46:02 | mpathb: addmap [0 1115734016 multipath 1 queue_if_no_path 1 alua 2 1 round-robin 0 1 1 8:16 1 round-robin 0 1 1 8:128 1]
  Feb 22 14:46:02 | libdevmapper: ioctl/libdm-iface.c(1876): device-mapper: reload ioctl on mpathb failed: Device or resource busy
  Feb 22 14:46:02 | mpathb: domap (0) failure for create/reload map
  <...>
  Feb 22 14:46:02 | mpathc: addmap [0 1115734016 multipath 1 queue_if_no_path 1 alua 2 1 round-robin 0 1 1 8:32 1 round-robin 0 1 1 8:144 1]
  Feb 22 14:46:02 | libdevmapper: ioctl/libdm-iface.c(1876): device-mapper: reload ioctl on mpathc failed: Device or resource busy
  Feb 22 14:46:02 | mpathc: domap (0) failure for create/reload map
  <...>
  Feb 22 14:46:02 | mpathd: addmap [0 1115734016 multipath 1 queue_if_no_path 1 alua 2 1 round-robin 0 1 1 8:48 1 round-robin 0 1 1 8:160 1]
  Feb 22 14:46:02 | libdevmapper: ioctl/libdm-iface.c(1876): device-mapper: reload ioctl on mpathd failed: Device or resource busy
  Feb 22 14:46:02 | mpathd: domap (0) failure for create/reload map
  <...>
  Feb 22 14:46:02 | mpathe: addmap [0 1115734016 multipath 1 queue_if_no_path 1 alua 2 1 round-robin 0 1 1 8:64 1 round-robin 0 1 1 8:176 1]
  Feb 22 14:46:02 | libdevmapper: ioctl/libdm-iface.c(1876): device-mapper: reload ioctl on mpathe failed: Device or resource busy
  Feb 22 14:46:02 | mpathe: domap (0) failure for create/reload map
  <...>
  Feb 22 14:46:02 | mpathf: addmap [0 1115734016 multipath 1 queue_if_no_path 1 alua 2 1 round-robin 0 1 1 8:80 1 round-robin 0 1 1 8:192 1]
  Feb 22 14:46:02 | libdevmapper: ioctl/libdm-iface.c(1876): device-mapper: reload ioctl on mpathf failed: Device or resource busy
  Feb 22 14:46:02 | mpathf: domap (0) failure for create/reload map

  After fix:

  Feb 23 20:34:20 disk-detect: create: mpatha (1IBM_IPR-10_5ED5AD0000000020) undef IBM,IPR-10  5ED5AD00
  Feb 23 20:34:20 disk-detect: size=532G features='0' hwhandler='1 alua' wp=undef
  Feb 23 20:34:20 disk-detect: |-+- policy='round-robin 0' prio=50 status=undef
  Feb 23 20:34:20 disk-detect: | `- 0:2:0:0 sda 8:0   undef ready running
  Feb 23 20:34:20 disk-detect: `-+- policy='round-robin 0' prio=10 status=undef
  Feb 23 20:34:20 disk-detect:   `- 1:2:0:0 sdh 8:112 undef ready running
  Feb 23 20:34:20 disk-detect: create: mpathb (1IBM_IPR-0_5ED5930000000040) undef IBM,IPR-0   5ED59300
  Feb 23 20:34:20 disk-detect: size=532G features='0' hwhandler='1 alua' wp=undef
  Feb 23 20:34:20 disk-detect: |-+- policy='round-robin 0' prio=50 status=undef
  Feb 23 20:34:20 disk-detect: | `- 0:2:1:0 sdb 8:16  undef ready running
  Feb 23 20:34:20 disk-detect: `-+- policy='round-robin 0' prio=10 status=undef
  Feb 23 20:34:20 disk-detect:   `- 1:2:1:0 sdi 8:128 undef ready running
  Feb 23 20:34:20 disk-detect: create: mpathc (1IBM_IPR-0_5ED5930000000020) undef IBM,IPR-0   5ED59300
  Feb 23 20:34:20 disk-detect: size=532G features='0' hwhandler='1 alua' wp=undef
  Feb 23 20:34:20 disk-detect: |-+- policy='round-robin 0' prio=50 status=undef
  Feb 23 20:34:20 disk-detect: | `- 0:2:2:0 sdc 8:32  undef ready running
  Feb 23 20:34:20 disk-detect: `-+- policy='round-robin 0' prio=10 status=undef
  Feb 23 20:34:20 disk-detect:   `- 1:2:2:0 sdj 8:144 undef ready running
  Feb 23 20:34:20 disk-detect: create: mpathd (1IBM_IPR-0_5ED5930000000100) undef IBM,IPR-0   5ED59300
  Feb 23 20:34:20 disk-detect: size=532G features='0' hwhandler='1 alua' wp=undef
  Feb 23 20:34:20 disk-detect: |-+- policy='round-robin 0' prio=50 status=undef
  Feb 23 20:34:20 disk-detect: | `- 0:2:3:0 sdd 8:48  undef ready running
  Feb 23 20:34:20 disk-detect: `-+- policy='round-robin 0' prio=10 status=undef
  Feb 23 20:34:20 disk-detect:   `- 1:2:3:0 sdk 8:160 undef ready running
  Feb 23 20:34:20 disk-detect: create: mpathe (1IBM_IPR-0_5ED59300000000E0) undef IBM,IPR-0   5ED59300
  Feb 23 20:34:20 disk-detect: size=532G features='0' hwhandler='1 alua' wp=undef
  Feb 23 20:34:20 disk-detect: |-+- policy='round-robin 0' prio=50 status=undef
  Feb 23 20:34:20 disk-detect: | `- 0:2:4:0 sde 8:64  undef ready running
  Feb 23 20:34:20 disk-detect: `-+- policy='round-robin 0' prio=10 status=undef
  Feb 23 20:34:20 disk-detect:   `- 1:2:4:0 sdl 8:176 undef ready running
  Feb 23 20:34:20 disk-detect: create: mpathf (1IBM_IPR-0_5ED59300000000C0) undef IBM,IPR-0   5ED59300
  Feb 23 20:34:20 disk-detect: size=532G features='0' hwhandler='1 alua' wp=undef
  Feb 23 20:34:20 disk-detect: |-+- policy='round-robin 0' prio=50 status=undef
  Feb 23 20:34:20 disk-detect: | `- 0:2:5:0 sdf 8:80  undef ready running
  Feb 23 20:34:20 disk-detect: `-+- policy='round-robin 0' prio=10 status=undef
  Feb 23 20:34:20 disk-detect:   `- 1:2:5:0 sdm 8:192 undef ready running
  Feb 23 20:34:20 disk-detect: create: mpathg (1IBM_IPR-0_5ED59300000000A0) undef IBM,IPR-0   5ED59300
  Feb 23 20:34:20 disk-detect: size=532G features='0' hwhandler='1 alua' wp=undef
  Feb 23 20:34:20 disk-detect: |-+- policy='round-robin 0' prio=50 status=undef
  Feb 23 20:34:20 disk-detect: | `- 0:2:6:0 sdg 8:96  undef ready running
  Feb 23 20:34:20 disk-detect: `-+- policy='round-robin 0' prio=10 status=undef
  Feb 23 20:34:20 disk-detect:   `- 1:2:6:0 sdn 8:208 undef ready running
  Feb 23 20:34:20 disk-detect: Multipath devices found; enabling multipath support

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